$OpenBSD: patch-jackd_jackd_1_in,v 1.3 2015/05/05 19:45:19 sthen Exp $
--- jackd/jackd.1.in.orig	Wed Jan 22 10:08:05 2014
+++ jackd/jackd.1.in	Sun Apr 19 14:47:08 2015
@@ -28,8 +28,9 @@ For the latest JACK information, please consult the we
 .br
 Select the audio interface backend.  The current list of supported
 backends is: \fBalsa\fR, \fBcoreaudio\fR, \fBdummy\fR, \fBfreebob\fR,
-\fBoss\fR \fBsun\fR and \fBportaudio\fR.  They are not all available
-on all platforms.  All \fIbackend\-parameters\fR are optional.
+\fBoss\fR \fBsun\fR \fBsndio\fR and \fBportaudio\fR.  They are not
+all available on all platforms.  All \fIbackend\-parameters\fR are
+optional.
 .TP
 \fB\-h, \-\-help\fR
 .br
@@ -490,6 +491,43 @@ Specify output device for playback (default: /dev/audi
 .TP
 \fB\-b, \-\-ignorehwbuf \fIboolean\fR
 Specify, whether to ignore hardware period size (default: false)
+.SS SNDIO BACKEND PARAMETERS
+.TP
+\fB\-r, \-\-rate \fIint\fR
+Specify the sample rate.  The default is 44100.
+.TP
+\fB\-p, \-\-period \fIint\fR
+Specify the number of frames between JACK \fBprocess()\fR calls.  This
+value must be a power of 2, and the default is 1024.  If you need low 
+latency, set \fB\-p\fR as low as you can go without seeing xruns.  A larger 
+period size yields higher latency, but makes xruns less likely.  The JACK 
+capture latency in seconds is \fB\-\-period\fR divided by \fB\-\-rate\fR.
+Note that this value is mostly advisory when aucat server is running
+and may be updated internally.
+.TP
+\fB\-n, \-\-nperiods \fIint\fR
+Specify the number of periods in the hardware buffer.  The default is
+2.  The period size (\fB\-p\fR) times \fB\-\-nperiods\fR times four
+(assuming 2 channels 16-bit samples) is the JACK buffer size in bytes.
+The JACK output latency in seconds is \fB\-\-nperiods\fR times
+\fB\-\-period\fR divided by \fB\-\-rate\fR.
+Note that this value is mostly advisory when aucat server is running
+and may be updated internally.
+.TP
+\fB\-w, \-\-wordlength \fIint\fR
+Specify the sample size in bits. The default is 16.
+.TP
+\fB\-i, \-\-inchannels \fIint\fR
+Specify how many channels to capture (default: 2)
+.TP
+\fB\-o, \-\-outchannels \fIint\fR
+Specify number of playback channels (default: 2)
+.TP
+\fB\-d, \-\-device \fIdevice_file\fR
+Specify device for capture and playback (default: NULL)
+.TP
+\fB\-b, \-\-ignorehwbuf \fIboolean\fR
+Specify, whether to ignore hardware period size (default: false)
 .SS PORTAUDIO BACKEND PARAMETERS
 .TP
 \fB\-c \-\-channel\fR
@@ -540,6 +578,8 @@ Print usage message for the parameters specific to eac
 \fBjackd \-d oss \-\-help\fR
 .br
 \fBjackd \-d sun \-\-help\fR
+.br
+\fBjackd \-d sndio \-\-help\fR
 .br
 \fBjackd \-d portaudio \-\-help\fR
 .PP
